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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e82c0be9529f5cfaf83ecb80158ee6bf03e25a95359b6d9f0cc484e711d6926b' 
  AND token = '2XTqTHvsszOH5y5gtlHpprU8cmagbZcj4DWbqxYZc/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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