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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b8532a5fc855780b8c28bc10f9e32adcc9bc9d99c5c992ecccfa2342a0a8b22' 
  AND token = '8Ice2LawHKoN1EyJ9Kkde1tKWMdkZcdjwbm53DBpl9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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