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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '471a302105e851c0ffcda3652be5778f886c215fb9f0eae72d001fa58fdba642' 
  AND token = 'WD5L+0beCGl5AveY8CoFCGNkAUn9IE929qZd8Mie1GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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