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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1ae4e0292aa57c56f175d6c2c11cc42f64e5adea2f08c8f529f8232b7804a69' 
  AND token = 'y1sWUeJL6z4zi/uw3xyJw3jqCdSCDiJBz0sUND8mVA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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