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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bccfbc8d33dc808b1d2a48e057db9d59e8cb175b990e82b5736e003860b5bf8' 
  AND token = 'fBI13vgp2OhVY7WwhrmeZo03rg8g3LtrAOZBSOkTTVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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