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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd39700542aabec0b1c258a832b707cbea86a5d3f13bf74a1c269c379cce213' 
  AND token = 'rOMn0bP2XnYLzJoJ6Hgv85Fdo8TfLLast2yAVxDD7Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}