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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c233eb1af430f42a31f7363656f5ba10207582faf2c445671eea239a4b5adc' 
  AND token = 'PBw60yj8irQ10se5nfiR2Vp/daKLeGAqwNF2MCJYwT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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