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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0697e8823ca543ea6165cd7c123820b598ced1102a0e6ba8d66ddbd39c59baa8' 
  AND token = 'YU6iTniS0ux1hXqQF60K/wNSrTliE7UEPXtAyu0Iri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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