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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a50c0b84e4aa2b6353a455c00640d64654779c5d2fde92faeec0c0989629738' 
  AND token = '3kPksv4N6cLiyMy+VWu6BtkOLBXD74hRWCnpuwQZlDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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