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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cede23df10ac2c9497ee671b2a3e782dad79fcda4a21313246ea019873664a9' 
  AND token = '/LodwuMBqAnAGeNX7nBcY9+uLgRQGuaMr1gJ9KsKq+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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