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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2cf9537e468c5b759f93dac20bfce4948786d0731cf2cb079a906bd3bc25fdb' 
  AND token = '4c72GyRv29NZVG0wqbkNRi0JreuGCuFns7gsxFxMeP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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