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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ad946d3c2f6af12caf390a9176cb4bf531d1f6137ed0e98259ea68087399d1' 
  AND token = 'HnuZTH+nW0gwTNQPcy8OcaGY9os6txbqbTgI891ZeHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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