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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c7fe8c699295de9ecda4b943f40bd20ab6e75e791bf341e02964f4f53c39331' 
  AND token = 'V4KMZERqM6cfy/KWi1pbVN2JN4BjU7mu2WE0YPsruVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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