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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23160e2eab34f6c216007bc533405b856578119c8803de8d87e7d43870656876' 
  AND token = 'IHmHRXNx3y2QpoT6gpa+oPyrKiWA6EP1v4ni+BgsgWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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