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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6756868c43d770a0816695fbfc3e2ddee05085c7c971bce77f49c83c65fc561c' 
  AND token = 'htygkxVU5bMqAM1u6YxNVISzDnI+P77QkPbQp6CILBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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