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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5289573fdbb914d3a0e413ae9e252be89de17f988aecf0e3d4aff71226bf680c' 
  AND token = 'O9SdBQxEPGO/isakGo6PAdqwrdRSuc6Ltokm3Es2kBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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