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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '563b2f3453b194d7ebd7ad89961dd8793ee9892aa9139172c749298f3387bb11' 
  AND token = 'm7UtOfYKpz1Ao6H6XR+93Xq2Z5DlxTtz7zH3Cg1eFso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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