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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb869c49e9947c0eaac15128d5bede48696295022d02d4df1d4aa565b050534' 
  AND token = 'mPOJww/4U3X6MJqzf+Payobro3gJgE2xaWzYwr2pX4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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