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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1866c227c44574a83ef5e8f5d968fe04a05506d4c0105d01817530a2b13d35' 
  AND token = 'JVR/oSJyB/6kfmaYxdAIbTiLx1uUApPAThanx+n54ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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