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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '780c51e54374ef2c7c1b45fac74bad4d13f9624917b01895a44489f0c5d856db' 
  AND token = 'EaXBobJLYF1jjQHWjXSlVIBktSs8cAf04TyPWRGN8RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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