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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e61998b70accb290c8b3d5d6c846e1772eac245e3472d3eed74777e7e424750' 
  AND token = '9FKljMnrhf7j6C32nYnHtmK5RyS9B66IGInJNZ3hOrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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