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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12901c3d1db5ea3700db11191d78f282bff4c5be0364da0ef815d92648d67a90' 
  AND token = '91ucd/pjftasm01AL6/kZpLIjtemwb1qLQ6+x4T+Szw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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