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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84de8e8c1ce497eff2a7a5612e13b4a424b90f3f144c13ddad314fd058936e69' 
  AND token = '5Cxm7awcgA7qIXIG540wM8LKgXheV6r9B6OXrkU/riI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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