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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3236a81daa0a7e72d26c10cc9c87e69fe47e86f473ca2fdd6b57f8ded5cb70f1' 
  AND token = 'XeCeyqcsHlXjTdjBZUo/XVc43eKSb46tLmxvoCFXKsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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