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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '235bb75fac91a455c989f6b189a7570d55fcd9a13226f30c03b85119539eb653' 
  AND token = 'bjll2Jwt+xr0/B6PtEEnhBthG7/kHf0NF1ijEfu8pvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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