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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '244925c5402a27aa0888fe86ba147bb037d7cbc2b2f6c141751ab19824c3e83d' 
  AND token = 'uFG+u1PJzcRQ3wlqFGumbFp71JTYisRoLtD1NM2f6E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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