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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d82b217887cf74003c0d2e49b6c8f454aaa47f2d2f9e23e338b868b5013981c' 
  AND token = 'oLdUQs/uNlkEkuC/Yo2Ou8t428V+fcrFybcdxKC3u7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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