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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df5ee4d643b442211401aab89575e513c3358dbe472323e78152a6a74d75e890' 
  AND token = 'HWnLPWGXv70cpsyvPEnPQDODcVKWhUAo3kpqyo7U8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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