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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2f6b54ffc0e965689e9e6d08a4fcf849bbdc7c7396bf91f0212c4f9c85003d' 
  AND token = 'KQUAoDRMTZQKZlfwJ/p1Kg4Dsoo3NQHe39nEwXaVpE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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