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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed1aeb093aaedbb4963507f716d543b82defdf98d32161ad2adf0bc1c9cf709c' 
  AND token = 'sVgH55BL/O7QuS5ry6VMqWi8N67y/69Z/dbG5QTDlqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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