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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94cfd1f25b79bf91d51efffefd2152e1fdd6c9f85f92f9cf312a98d61b217b0' 
  AND token = '2jFYdk9jg49G/CgeqhhkV+buf57eYln0iU4XLvK/keE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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