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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73fbf4c2c544faafaef94aae68cf7f6696efceb00ec21cd33f092e12aa3691ef' 
  AND token = 'AnFAzC0gW4U5APoGpwsbNgPreZaS9JAWAgO9HyWXAW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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