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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0764f43da14b042567de0da91ad4a8acd7cf2a49b713ca90aed73899ee781af4' 
  AND token = 'n5Pon3Yk0N+6/iNLgArpvJ2g1ZcPG7vamZhC3Nxhjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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