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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '450ee62c46e80c70572a2740b3bb1d5b84531c33288da4c57f52f06974512b38' 
  AND token = 'r8dcJVJlMXcWIu57yD1Sfm39K67t1fhpnOXIWgcAGo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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