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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c92c003196d351e433839f599969cf450ef9b1e37d57cacc23d0cb547475926' 
  AND token = '3V2lWtk8zBwzlWZPhZnCCVx2oM1z8F3tVblT6R1zAoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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