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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82eadcbb8e20965d0df261b0ba14cc3c2f715d1d0141db0c8f1595a60af61369' 
  AND token = 'z2LZMvdhnsxCDxoaZsiDWJBe9NQhdiMlPn5L6gtOW30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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