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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '867176479c4988589cc7980e998c93ae68ca26061a698c2920bc78c1eae26a11' 
  AND token = '4vSodO0ScTzeyaQoI4+IL5l2xzitdg8OGf5E5RuXMP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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