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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628412dbd124068a97f9ebb0e91b27855095c77d1c1ecfbedbbfa16ce54440e3' 
  AND token = 'bjut/DwWgz7cbI7su6WvvBlrqa1DOZbMQYWhesCvTu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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