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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '764da87311b1134e5077449adad9d3501fdde98faf9755a47bc8627da895c5ff' 
  AND token = 'uo//ogHYkprqEeJaOiiWE8jOpmIJxxOFFUu122kZVtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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