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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1acb3a72b99718d40ff63a5f2d9ee44f0be47e3a49eabc4e6761d3bebbc9c38a' 
  AND token = 'fxz+fJKsI1ZEVSRYPbyUa+eSfahbg4dpIVHI8dAh3Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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