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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58139e598f10cb988ee23c209ad0b4757564152a01a6b4be011b65ef63c1419b' 
  AND token = 'hOY9ZHGL5FpGnCW1KGTzNfAHTmSjHGpt4rbtWX39g8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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