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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a7f3bebb608b61a8b105aa0436d2138efbe4eb9af36e9657b273b360dfd4e6e' 
  AND token = '3XVSnHgYDJIfE1sW67i1SwuG9eHhhYI1wXYzYfJLccU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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