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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c1c394467f5a3296851276387d32bbf7ace514f05b7f0c2bc44c4085628411' 
  AND token = 'XNTniMzncnXbwSz/ThT3v7Mls8LcxxTA/Y4tcDepfU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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