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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1db0657c827bdf481709bdd7a7b107ee8f793d898fda6350bf84d8af81a44dec' 
  AND token = 'MwOx5cX1bS3/NwG60RPn56KOHgP41NCpZ2dJfUD+UbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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