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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84bd06188a9065905bf03ed60151c7ba47114c5a5070397b92aa0c55814cefb9' 
  AND token = 'rTjI3Vx+ermtSMzcI3bXOgbjxuMY7trNVNYyWm+vbPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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