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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f48c0d9f67e4d32d33ea4e5fc1bb6cb66fa3705582aa6a99e9fcd2fbf26db9b9' 
  AND token = 'Bl5uNf05e+8laOVgia+cwALmfnACVZP78tLmOppYq2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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