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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a18dc7a04a1bdefaef7f289b129cf32fd9114d95cab3869f6a60ff5db0b6ff5' 
  AND token = 'tYpp2aLpoBbsx4EWkS7aVXRuEfvB8K5ge0eGh9eBNfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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