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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f28e6d3ee939fd43f7781a10f307a0903f37a61ce1c20c5adcbe55298818a03e' 
  AND token = 'PUcmh4O9/h8RxVfmUblPF0D+4fQVGZo50STfhT+274Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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