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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be3aaa252ea01a362f7763bf5fc4fa3159fae3a039f7d01756e7c44999d7f87a' 
  AND token = 'TNRLzT6IUYQaIvk7YIa9deD02pJqv7IPtMSnhPxysE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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