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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57eca6b8ec5d326cf349c2c444a67ade44bd34bb9dcf5dd2f1b8fb0e2311cd62' 
  AND token = '+AVQoUabYXtRUruSNwMaLe7tJuCfpJHIqQIhlE1VEKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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