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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30fb722374b070ec9c80064484d3a49f16981e7e32a6366140c65addc3205401' 
  AND token = 'EzxwAb3brKXhPlFtF4rVhCvimM+HAB0Ag+tmSe/Fi6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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