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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3cc24dd69fb80c0eefb8aecb6556cf53c34c4c42989c58b7be09f21a147ec56' 
  AND token = 'ByD6jbeoQPXxyRGls4RWCP1qJ26wbTTZCi9XK2nLX1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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