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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c11dc1d68beaf326c4b868a7411befc1fa3661ef28d55dfeebfa647417c289a8' 
  AND token = '6XODuP/BZDsdf1DmeMHJUBodVEpyhuwAviCELmL5jKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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