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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65ca4979bc4d24be264dc5411f64adb02c4e8907c241a3284eaa4541542f2ad3' 
  AND token = 'rBcGdxY0R4cg802neAVlY/szKqQkHLAxaf4YqD5+AdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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