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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2f0423a5b1ecae0da53c5ed71869491240e85e6e9d021913f6b2b8a76beffa4' 
  AND token = 'fv1KfI8PGiRpBQGZbEx068QH0k4MC7DwBaT4RIE7TKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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